Form disjointer



y 6, 1952 c. E. MORRIS 2,595,807

FORM DISJOINTER Filed May 19, 1950 Ch ar/es E. Morris W I IN V EN TOR. j" Y Patented May 6, 1952 FORM DISJOINTEB,

Charles E. Morris, Phoenix, Ariz., assignor of onehalf to F. W. Schammel, Phoenix, Aria, and one-half to Lyle S. Spencer, Watertown, S. Dak.

Application May 19, 1950, Serial No. 162,927

6 Claims. 1

This invention relates to a class of tools and more particularly to a device which may be effectively used in dismantling wooden forms which have been used to form concrete structures.

When building toward concrete structures as is well known after the concrete sets the forms therefore are normally removed by means of a crow bar or sledge hammer in order that other structure may be added to the building. When using these crow bars or sledges the beams and ribs of the forms are usually heavily damaged and are rarely of any further use. It is therefore an object of this invention to provide a device which may be used for removing forms for concrete structures, which device when used will remove the forms without doing damage to them.

A further object of this invention is to provide a tool having opposed jaws and having a working lever which has rollers mounted thereon for engagement with the jaw so as to actuate them.

Still further objects of the invention reside in the provision of a tool of this nature that is strong, durable, highly efficientin operation, simple in construction and manufacture, capable of being readily and easily manufactured, and which is quite inexpensive.

These, together-with the various ancillary objects of the invention which will become apparent as the following description proceeds, are attained by this form disjointer, a preferred embodiment of which has been illustrated in the accompanying drawings, by way of example only, wherein:

Figure 1 is a side elevational view showing the form disjointer comprising the present invention in position ready for removal of a beam or stud from the forms, which beam has been used to support the forms;

Figure 2 is a front elevational view of the device;

Figure 3 is a top plan view of the tool with parts thereof being broken away to show other parts in greater detail; and,

Figure 4 is a sectional view showing the construction of the cam surfaces and the means for retaining the dual members.

With continuing reference to the accompanying drawings wherein like reference numerals indicate similar parts throughout the various views, the reference numeral It generally designates a form which is used to retain and mold poured concrete [2 therewithin. Suitable beams or studs I' l are used to support the forms Ill. These beams are nailed or otherwise secured to the forms l and the tool which is generally indicated at It is provided for removing these members from the forms in an undamaged state.

The form disjointer [6 includes a pair of opposed jaws !8 and 20 which have grasping portions 22 and 24 adjacent opposed ends thereof. The jaw members l8 and 20 are further provided with offset portions 26 and 28 respectively which are adapted to provide cam surfaces for engagement by rollers 30 and 32 attached to a working lever 34. For covering and protecting the jaw members i8 and 29 there are provided cover plates 36 and 38.

By means of a rod it a fixed lever 42 is pivotal- 1y secured to the jaw members l8 and 29. A pair of legs 44 and 46 are Welded to the lever 42 and are pivotally attached to the lever 34 by means of the pin 48. Pivotally attached to the legs 44 and 46 are fulcrum stands 50 and 52 which are preferably of angle iron cross section.

There is provided a carriage bolt 54 on which nuts 56 are secured at the ends forming stop members and on which tension springs 58 are positioned biasing the stop members 56 and the jaw members l8 and 20 in order to hold the jaw assembly intact. Thus, the springs 58 continuously urge the jaws into engagement with the rollers 3!] and 32. However, there is relatively little wear due to the holding engagement between the rollers 30 and 32 and the jaw members 2B and 28 in the head of the tool.

In operation, a tool is positioned with the jaws astride one of the beams or ribs. The working lever 34 is then pressed down which causes the jaw bars to close under the bottom edge of the rib or beam. The fixed lever is now pressed downward which results in a pivot-like walking action effected by the fulcrum stands 50 and 52. The jaw bar loosens the beam as the operator draws the fixed lever of the disjointer toward him.

Since the beams I4 have been secured with the forms W- with the nails used in securing these members on the face or concrete side of the forms, the nails are left in the forms in an unbent position which enables a laborer to easily drive the nails out of the forms so that these forms may be used again.

Thus, this tool enables a form to be dismembered while preserving such against damage.

Since from the foregoing, the construction and advantages of this disjointing tool are readily apparent, further decription is believed to be unnecessary.

It is to be understood that this tool can be worked or operated in other positions and that since numerous modifications will readily occur to those skilled in the art, it is not intended to limit the invention to the precise embodiment shown and described, but all suitable modifications and equivalents may be readily resorted to which fall within the scope of the appended claims.

Having described the claimed as new is:

1. A tool comprising a pair of opposed jaw members, cam surfaces on said jaw members, a working lever, rollers rotatably mounted on said working lever engaging said cam surfaces on said jaw members, means continuously urging said jaw members into engagement with said rollers, a second lever pivotally attached to said jaw members, a pair of leg meminvention, what is bers rigidly secured to said second lever, said leg members being pivotally attached to said working lever, and fulcrum stands pivotally attached to said leg members.

2. A tool comprising a pair of opposed jaw members, cam surfaces on said jaw members, a working lever, rollers rotatably mounted on said working lever engaging said cam surfaces on said jaw members, means continuously urging said jaw members into engagement with said rollers, said means including a rod extending through apertures in said jaw members, stop members on the ends of said rods, and tension springs biasing said jaw members and said stop members, a second lever pivotally attached to said jaw members, a pair of leg members rigidly secured to said second lever, said leg membersbeing pivotally attached to said working lever, and fulcrum stands pivotally attached to said leg members.

3. A tool comprising a pair of opposed jaw members, cam surfaces on said jaw members, a working lever, rollers rotatably mounted on said working lever engaging said cam surfaces on said jaw members, means continuously urging said jaw members into engagement with said rollers, and lever means pivotally attached to said working lever and to said jaw members.

4. A tool comprising a pair of opposed jaw members, cam surfaces on said jaw members, a working lever, rollers rotatably mounted on said working lever engaging said cam surfaces on said jaw members, means continuously urging said jaw members into engagement with said rollers, said means including a rod extending through apertures in said jaw members, stop members on the ends of said rods, and tension springs biasing said jaw members and said stop members, and lever means pivotally attached to said working lever and to said jaw members.

5. A tool comprising a pair of opposed jaw members, cam surfaces on said jaw members, a working lever, rollers rotatably mounted on said working lever engaging said cam surfaces on said jaw members, means continuously urging said jaw members into engagement with said rollers, a second lever pivotally attached to said jaw members, a pair of leg members rigidly secured to said second lever, said leg members being pivotally attached to said working lever, and fulcrum stands pivotally attached to said leg members, said cam surfaces on said jaw members being formed by offset portions of said jaw members.

6. A tool comprising a pair of opposed jaw members, cam surfaces on said jaw members, a working lever, rollers rotatably mounted on said working lever engaging said cam surfaces on said jaw members, means continuously urging said jaw members into engagement with said rollers, said means including a rod extending through apertures in said jaw members, stop members on the ends of said rods, tension springs biasing said jaw members and said stop members, and lever means pivotally attached to said working lever and to said jaw members, said cam surfaces on said jaw members being formed by offset portions of said jaw members.

CHARLES E. MORRIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES. PATENTS Number Name Date 50,834 McConnell Nov. '7, 1865 382,029 Casey May 1, 1888 

